GreenGuard RainDrop 3D Building Wrap is a cross-woven polyolefin building wrap designed with an enhanced contour to facilitate the drainage of water that penetrates the exterior cladding, which is the primary weather barrier of a wall system. The contour won't crimp, collapse, or flatten, ensuring water will drain no matter how tightly cladding is nailed to the wall. It is a recognized air barrier material listed with www.airbarrier.org, and it has demonstrated water holdout capabilities in industry recognized water resistance tests. This non-perforated wrap also breathes to allow moisture vapor to escape. Stays UV-stable up to 9 months. It is an excellent secondary weather barrier that helps deflect water and wind-driven rain, yet is designed to breathe to assist trapped moisture vapor to escape, helping walls dry faster.